// SPDX-License-Identifier: GPL-2.0-or-later /* * PowerPC 476FPE board specific routines * * Copyright © 2013 Tony Breeds IBM Corporation * Copyright © 2013 Alistair Popple IBM Corporation * * Based on earlier code: * Matt Porter * Copyright 2002-2005 MontaVista Software Inc. * * Eugene Surovegin or * Copyright (c) 2003-2005 Zultys Technologies * * Rewritten and ported to the merged powerpc tree: * Copyright 2007 David Gibson , IBM Corporation. * Copyright © 2011 David Kliekamp IBM Corporation */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static const struct of_device_id ppc47x_of_bus[] __initconst = { { .compatible = "ibm,plb4", }, { .compatible = "ibm,plb6", }, { .compatible = "ibm,opb", }, { .compatible = "ibm,ebc", }, {}, }; /* The EEPROM is missing and the default values are bogus. This forces USB in * to EHCI mode */ static void quirk_ppc_currituck_usb_fixup(struct pci_dev *dev) { if (of_machine_is_compatible("ibm,currituck")) { pci_write_config_dword(dev, 0xe0, 0x0114231f); pci_write_config_dword(dev, 0xe4, 0x00006c40); } } DECLARE_PCI_FIXUP_HEADER(0x1033, 0x0035, quirk_ppc_currituck_usb_fixup); /* Akebono has an AVR microcontroller attached to the I2C bus * which is used to power off/reset the system. */ /* AVR I2C Commands */ #define AVR_PWRCTL_CMD (0x26) /* Flags for the power control I2C commands */ #define AVR_PWRCTL_PWROFF (0x01) #define AVR_PWRCTL_RESET (0x02) static struct i2c_client *avr_i2c_client; static void __noreturn avr_halt_system(int pwrctl_flags) { /* Request the AVR to reset the system */ i2c_smbus_write_byte_data(avr_i2c_client, AVR_PWRCTL_CMD, pwrctl_flags); /* Wait for system to be reset */ while (1) ; } static void avr_power_off_system(void) { avr_halt_system(AVR_PWRCTL_PWROFF); } static void __noreturn avr_reset_system(char *cmd) { avr_halt_system(AVR_PWRCTL_RESET); } static int avr_probe(struct i2c_client *client) { avr_i2c_client = client; ppc_md.restart = avr_reset_system; pm_power_off = avr_power_off_system; return 0; } static const struct i2c_device_id avr_id[] = { { "akebono-avr", 0 }, { } }; static struct i2c_driver avr_driver = { .driver = { .name = "akebono-avr", }, .probe_new = avr_probe, .id_table = avr_id, }; static int __init ppc47x_device_probe(void) { i2c_add_driver(&avr_driver); of_platform_bus_probe(NULL, ppc47x_of_bus, NULL); return 0; } machine_device_initcall(ppc47x, ppc47x_device_probe); static void __init ppc47x_init_irq(void) { struct device_node *np; /* Find top level interrupt controller */ for_each_node_with_property(np, "interrupt-controller") { if (of_get_property(np, "interrupts", NULL) == NULL) break; } if (np == NULL) panic("Can't find top level interrupt controller"); /* Check type and do appropriate initialization */ if (of_device_is_compatible(np, "chrp,open-pic")) { /* The MPIC driver will get everything it needs from the * device-tree, just pass 0 to all arguments */ struct mpic *mpic = mpic_alloc(np, 0, MPIC_NO_RESET, 0, 0, " MPIC "); BUG_ON(mpic == NULL); mpic_init(mpic); ppc_md.get_irq = mpic_get_irq; } else panic("Unrecognized top level interrupt controller"); of_node_put(np); } #ifdef CONFIG_SMP static void smp_ppc47x_setup_cpu(int cpu) { mpic_setup_this_cpu(); } static int smp_ppc47x_kick_cpu(int cpu) { struct device_node *cpunode = of_get_cpu_node(cpu, NULL); const u64 *spin_table_addr_prop; u32 *spin_table; extern void start_secondary_47x(void); BUG_ON(cpunode == NULL); /* Assume spin table. We could test for the enable-method in * the device-tree but currently there's little point as it's * our only supported method */ spin_table_addr_prop = of_get_property(cpunode, "cpu-release-addr", NULL); if (spin_table_addr_prop == NULL) { pr_err("CPU%d: Can't start, missing cpu-release-addr !\n", cpu); return 1; } /* Assume it's mapped as part of the linear mapping. This is a bit * fishy but will work fine for now * * XXX: Is there any reason to assume differently? */ spin_table = (u32 *)__va(*spin_table_addr_prop); pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table); spin_table[3] = cpu; smp_wmb(); spin_table[1] = __pa(start_secondary_47x); mb(); return 0; } static struct smp_ops_t ppc47x_smp_ops = { .probe = smp_mpic_probe, .message_pass = smp_mpic_message_pass, .setup_cpu = smp_ppc47x_setup_cpu, .kick_cpu = smp_ppc47x_kick_cpu, .give_timebase = smp_generic_give_timebase, .take_timebase = smp_generic_take_timebase, }; static void __init ppc47x_smp_init(void) { if (mmu_has_feature(MMU_FTR_TYPE_47x)) smp_ops = &ppc47x_smp_ops; } #else /* CONFIG_SMP */ static void __init ppc47x_smp_init(void) { } #endif /* CONFIG_SMP */ static void __init ppc47x_setup_arch(void) { /* No need to check the DMA config as we /know/ our windows are all of * RAM. Lets hope that doesn't change */ swiotlb_detect_4g(); ppc47x_smp_init(); } static int board_rev = -1; static int __init ppc47x_get_board_rev(void) { int reg; u8 __iomem *fpga; struct device_node *np = NULL; if (of_machine_is_compatible("ibm,currituck")) { np = of_find_compatible_node(NULL, NULL, "ibm,currituck-fpga"); reg = 0; } else if (of_machine_is_compatible("ibm,akebono")) { np = of_find_compatible_node(NULL, NULL, "ibm,akebono-fpga"); reg = 2; } if (!np) goto fail; fpga = of_iomap(np, 0); of_node_put(np); if (!fpga) goto fail; board_rev = ioread8(fpga + reg) & 0x03; pr_info("%s: Found board revision %d\n", __func__, board_rev); iounmap(fpga); return 0; fail: pr_info("%s: Unable to find board revision\n", __func__); return 0; } machine_arch_initcall(ppc47x, ppc47x_get_board_rev); /* Use USB controller should have been hardware swizzled but it wasn't :( */ static void ppc47x_pci_irq_fixup(struct pci_dev *dev) { if (dev->vendor == 0x1033 && (dev->device == 0x0035 || dev->device == 0x00e0)) { if (board_rev == 0) { dev->irq = irq_create_mapping(NULL, 47); pr_info("%s: Mapping irq %d\n", __func__, dev->irq); } else if (board_rev == 2) { dev->irq = irq_create_mapping(NULL, 49); pr_info("%s: Mapping irq %d\n", __func__, dev->irq); } else { pr_alert("%s: Unknown board revision\n", __func__); } } } /* * Called very early, MMU is off, device-tree isn't unflattened */ static int __init ppc47x_probe(void) { if (of_machine_is_compatible("ibm,akebono")) return 1; if (of_machine_is_compatible("ibm,currituck")) { ppc_md.pci_irq_fixup = ppc47x_pci_irq_fixup; return 1; } return 0; } define_machine(ppc47x) { .name = "PowerPC 47x", .probe = ppc47x_probe, .progress = udbg_progress, .init_IRQ = ppc47x_init_irq, .setup_arch = ppc47x_setup_arch, .restart = ppc4xx_reset_system, .calibrate_decr = generic_calibrate_decr, };